/* The Keeper and the Beacon - deck styles. Dark theater around real
   gameplay screenshots; the motion comes from the kb-a/kb-b Ken Burns
   keyframes the player toggles per screenshot. */

* {
  box-sizing: border-box;
  margin: 0;
}

:root {
  --bg: #0b1020;
  --panel: #121a30;
  --panel-2: #0e1526;
  --ink: #e8ecf8;
  --muted: #93a0c0;
  --accent: #f0a834;
  --accent-2: #4f83e0;
  --line: #223052;
}

html,
body {
  height: 100%;
}

body {
  background: radial-gradient(1200px 700px at 70% -10%, #17224066, transparent),
    var(--bg);
  color: var(--ink);
  font-family: 'Segoe UI', system-ui, sans-serif;
  overflow: hidden;
}

.shell {
  display: grid;
  grid-template-columns: 280px 1fr;
  grid-template-rows: 1fr auto;
  height: 100vh;
}

/* ---- chapter rail ---- */

.rail {
  grid-row: 1 / 3;
  background: var(--panel-2);
  border-right: 1px solid var(--line);
  padding: 22px 16px;
  overflow-y: auto;
}

.rail-title {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 18px;
}

.rail-title span {
  display: block;
  color: var(--accent);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 4px;
}

.chapters {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.chapters button {
  width: 100%;
  text-align: left;
  background: none;
  border: 0;
  color: var(--muted);
  font: inherit;
  font-size: 0.85rem;
  padding: 8px 10px;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  gap: 10px;
  align-items: baseline;
}

.chapters button:hover {
  background: #1a2440;
  color: var(--ink);
}

.chapters .num {
  color: var(--accent-2);
  font-variant-numeric: tabular-nums;
  font-size: 0.75rem;
}

.chapters li.active button {
  background: #1d2a4d;
  color: var(--ink);
  box-shadow: inset 2px 0 0 var(--accent);
}

/* ---- stage ---- */

.main {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 22px 28px 0;
  gap: 14px;
}

.slide-head #slide-eyebrow {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.72rem;
  font-weight: 600;
}

.slide-head #slide-title {
  font-size: 1.6rem;
  font-weight: 700;
  margin-top: 2px;
}

.stage {
  position: relative;
  flex: 1;
  min-height: 0;
  border-radius: 14px;
  overflow: hidden;
  background: #000;
  border: 1px solid var(--line);
  box-shadow: 0 20px 60px #00000088;
}

.layer {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.9s ease;
}

.layer img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
}

.layer.active {
  opacity: 1;
}

/* The literal keyframes: slow drift + zoom, two directions. Only the
   active layer animates; 26s outlasts any single keyframe's screen time
   so the motion never visibly loops. */

.layer.kb-a img {
  animation: kb-a 26s ease-out forwards;
}

.layer.kb-b img {
  animation: kb-b 26s ease-out forwards;
}

@keyframes kb-a {
  from {
    transform: scale(1) translate(0, 0);
  }
  to {
    transform: scale(1.08) translate(-1.5%, -2.5%);
  }
}

@keyframes kb-b {
  from {
    transform: scale(1.06) translate(1.2%, -1%);
  }
  to {
    transform: scale(1) translate(0, 0);
  }
}

.caption {
  position: relative;
  min-height: 34px;
  color: var(--muted);
  font-size: 0.95rem;
  font-style: italic;
  padding: 2px 4px 10px;
}

.caption.pop {
  animation: cap-in 0.6s ease both;
}

@keyframes cap-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---- transport ---- */

.transport {
  grid-column: 2;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 28px 18px;
}

.control {
  background: #1a2440;
  border: 1px solid var(--line);
  color: var(--ink);
  font: inherit;
  font-size: 0.85rem;
  padding: 8px 16px;
  border-radius: 999px;
  cursor: pointer;
}

.control:hover {
  background: #223055;
}

.control.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #1c1400;
  font-weight: 700;
  min-width: 88px;
}

.scrub {
  flex: 1;
  height: 8px;
  background: #1a2440;
  border-radius: 999px;
  cursor: pointer;
  overflow: hidden;
}

.scrub-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  border-radius: 999px;
}

.time {
  color: var(--muted);
  font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
  min-width: 92px;
  text-align: right;
}

.hint {
  color: #5a688c;
  font-size: 0.72rem;
}

/* ---- small screens: the deck stacks and the page scrolls ---- */

.rail-back {
  display: block;
  color: var(--accent-2);
  text-decoration: none;
  font-size: 0.78rem;
  margin-bottom: 14px;
}

.rail-back:hover {
  text-decoration: underline;
}

@media (max-width: 900px) {
  body {
    overflow: auto;
  }

  .shell {
    display: flex;
    flex-direction: column;
    height: auto;
    min-height: 100vh;
  }

  .rail {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    padding: 16px;
  }

  .chapters {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 6px;
  }

  .chapters button {
    width: auto;
    padding: 6px 10px;
    border: 1px solid var(--line);
  }

  .main {
    padding: 16px 14px 0;
  }

  .stage {
    flex: none;
    aspect-ratio: 16 / 10;
  }

  .transport {
    flex-wrap: wrap;
    padding: 12px 14px 20px;
  }

  .time {
    min-width: 0;
  }

  .hint {
    display: none;
  }
}

/* ---- keyframes that are documents, not photographs ----
   Synthetic frames (tables, ledgers) lose their bottom rows to the cover
   crop, so they letterbox instead and drift on scale alone. */

.layer.fit-contain {
  background: var(--bg);
}

.layer.fit-contain img {
  object-fit: contain;
  object-position: center;
}

.layer.fit-contain.kb-a img,
.layer.fit-contain.kb-b img {
  animation: kb-c 26s ease-out forwards;
}

@keyframes kb-c {
  from {
    transform: scale(1);
  }
  to {
    transform: scale(1.035);
  }
}

/* ---- the appendix: a static reference view, no narration ---- */

.rail-divider {
  margin: 16px 0 10px;
  border-top: 1px solid var(--line);
}

.rail-appendix {
  width: 100%;
  text-align: left;
  background: none;
  border: 1px solid var(--line);
  color: var(--muted);
  font: inherit;
  font-size: 0.85rem;
  padding: 9px 10px;
  border-radius: 8px;
  cursor: pointer;
  line-height: 1.35;
}

.rail-appendix span {
  display: block;
  color: #5a688c;
  font-size: 0.7rem;
  margin-top: 2px;
}

.rail-appendix:hover {
  background: #1a2440;
  color: var(--ink);
}

body.mode-appendix .rail-appendix {
  background: #1d2a4d;
  color: var(--ink);
  border-color: var(--accent);
  box-shadow: inset 2px 0 0 var(--accent);
}

body.mode-appendix .main,
body.mode-appendix .transport {
  display: none;
}

.appendix {
  grid-column: 2;
  grid-row: 1 / 3;
  min-width: 0;
  overflow-y: auto;
  padding: 24px 32px 60px;
  display: none;
}

body.mode-appendix .appendix {
  display: block;
}

.apx-head h1 {
  font-size: 1.6rem;
  font-weight: 700;
}

.apx-head .eyebrow {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.72rem;
  font-weight: 600;
}

.apx-head p {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 8px;
  max-width: 92ch;
  line-height: 1.5;
}

.apx-jump {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 14px 0 12px;
  margin: 14px 0 4px;
  background: linear-gradient(var(--bg) 78%, transparent);
}

.apx-jump a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.78rem;
  padding: 5px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
}

.apx-jump a:hover {
  background: #1a2440;
  color: var(--ink);
}

.apx-section {
  margin-top: 30px;
  scroll-margin-top: 68px;
}

.apx-section > h2 {
  font-size: 1.05rem;
  font-weight: 700;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.apx-section > h2 ~ h2 {
  margin-top: 26px;
}

.apx-section > h2 small {
  color: var(--muted);
  font-weight: 400;
  font-size: 0.8rem;
  margin-left: 10px;
}

/* screenshot gallery */

.apx-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(268px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.apx-tile {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  cursor: zoom-in;
  padding: 0;
  text-align: left;
  color: inherit;
  font: inherit;
  display: flex;
  flex-direction: column;
}

.apx-tile:hover {
  border-color: var(--accent-2);
}

.apx-tile img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  object-position: top center;
  background: #000;
  display: block;
}

.apx-tile .meta {
  padding: 9px 11px 11px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.apx-tile .file {
  font-size: 0.72rem;
  color: var(--accent-2);
  font-family: Consolas, 'Cascadia Mono', monospace;
  word-break: break-all;
}

.apx-tile .cap {
  font-size: 0.78rem;
  color: var(--muted);
  line-height: 1.4;
}

.apx-tile .used {
  font-size: 0.66rem;
  color: #5a688c;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* tables */

.apx-scroll {
  margin-top: 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: auto;
  max-height: 460px;
  background: var(--panel-2);
}

table.apx {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}

table.apx th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: #16203a;
  text-align: left;
  color: var(--muted);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  padding: 9px 12px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
}

table.apx th:hover {
  color: var(--ink);
}

table.apx th[aria-sort]::after {
  content: ' \25B2';
  color: var(--accent);
}

table.apx th[aria-sort='descending']::after {
  content: ' \25BC';
}

table.apx td {
  padding: 8px 12px;
  border-bottom: 1px solid #18213a;
  white-space: nowrap;
}

table.apx tbody tr:hover td {
  background: #16203a;
}

table.apx td.n,
table.apx th.n {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

table.apx tfoot td {
  border-top: 1px solid var(--line);
  border-bottom: 0;
  font-weight: 700;
  background: #131c33;
  position: sticky;
  bottom: 0;
}

.model-tag {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 600;
}

.m-opus-5 { background: #1d3a2a; color: #6ddb9b; }
.m-fable-5 { background: #3a2a10; color: #f0b45a; }
.m-sonnet-5 { background: #14243f; color: #7aa8ea; }
.m-haiku { background: #262d40; color: #7b88a8; }

.bar {
  height: 6px;
  border-radius: 999px;
  background: currentColor;
  min-width: 2px;
  display: block;
}

.apx-notes {
  margin-top: 16px;
  color: #6a789c;
  font-size: 0.78rem;
  line-height: 1.6;
  max-width: 110ch;
  padding-left: 18px;
}

.apx-notes li {
  margin-bottom: 6px;
}

.apx-notes b {
  color: var(--muted);
}

.apx-kv {
  margin-top: 14px;
  display: grid;
  grid-template-columns: 210px 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  font-size: 0.83rem;
}

.apx-kv > div {
  background: var(--panel-2);
  padding: 10px 14px;
}

.apx-kv .k {
  color: var(--muted);
}

.apx-kv .v {
  color: var(--ink);
  line-height: 1.5;
}

.apx-files {
  margin-top: 14px;
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.82rem;
}

.apx-files a {
  color: var(--accent-2);
  font-family: Consolas, 'Cascadia Mono', monospace;
  font-size: 0.78rem;
}

.apx-files span {
  color: var(--muted);
}

/* lightbox */

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 50;
  background: #05070ff2;
  display: none;
  flex-direction: column;
}

.lightbox.open {
  display: flex;
}

.lb-stage {
  flex: 1;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px 70px 6px;
}

.lb-stage img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: 6px;
  box-shadow: 0 30px 90px #000000cc;
}

.lb-bar {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 10px 24px 20px;
  color: var(--muted);
  font-size: 0.85rem;
}

.lb-bar .file {
  color: var(--accent-2);
  font-family: Consolas, 'Cascadia Mono', monospace;
  font-size: 0.78rem;
  white-space: nowrap;
}

.lb-bar .cap {
  flex: 1;
  font-style: italic;
  line-height: 1.4;
}

.lb-bar .count {
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.lb-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: #1a2440cc;
  border: 1px solid var(--line);
  color: var(--ink);
  font-size: 1.4rem;
  line-height: 1;
  width: 46px;
  height: 60px;
  border-radius: 10px;
  cursor: pointer;
}

.lb-nav:hover {
  background: #223055;
}

.lb-prev { left: 14px; }
.lb-next { right: 14px; }

.lb-close {
  position: absolute;
  top: 14px;
  right: 16px;
  background: #1a2440cc;
  border: 1px solid var(--line);
  color: var(--ink);
  font: inherit;
  font-size: 0.8rem;
  padding: 7px 14px;
  border-radius: 999px;
  cursor: pointer;
}

@media (max-width: 900px) {
  .appendix {
    padding: 16px 14px 40px;
  }

  .apx-kv {
    grid-template-columns: 1fr;
  }

  .lb-stage {
    padding: 12px 12px 4px;
  }

  .lb-nav {
    width: 38px;
    height: 50px;
  }
}

/* ---- judge-it-yourself: pairs and the listening station ---- */

.apx-lede {
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.55;
  margin-top: 12px;
  max-width: 105ch;
}

.apx-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 14px;
}

.apx-filter .chip {
  background: none;
  border: 1px solid var(--line);
  color: var(--muted);
  font: inherit;
  font-size: 0.76rem;
  padding: 5px 12px;
  border-radius: 999px;
  cursor: pointer;
  text-transform: capitalize;
}

.apx-filter .chip:hover {
  background: #1a2440;
  color: var(--ink);
}

.apx-filter .chip.on {
  background: var(--accent);
  border-color: var(--accent);
  color: #1c1400;
  font-weight: 700;
}

.apx-pairgrid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(212px, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.pair {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px 8px 9px;
  cursor: zoom-in;
  font: inherit;
  color: inherit;
  text-align: center;
}

.pair:hover {
  border-color: var(--accent-2);
}

.pair.t3 {
  border-color: #6b4a1c;
  background: #1b1426;
}

.pair .duo {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.pair .slot {
  background: #05070f;
  border-radius: 6px;
  padding: 5px 3px 3px;
}

.pair .slot.ref { border: 1px solid #3a2a10; }
.pair .slot.our { border: 1px solid #14243f; }

.pair .slot.none {
  border: 1px dashed #3a2a10;
  color: #6a789c;
  font-size: 0.66rem;
  line-height: 1.4;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 84px;
}

.pair .slot img {
  width: 100%;
  height: 66px;
  object-fit: contain;
  image-rendering: pixelated;
  display: block;
}

.pair .slot span {
  display: block;
  font-size: 0.58rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  font-weight: 700;
  margin-top: 3px;
}

.pair .slot.ref span { color: #f0b45a; }
.pair .slot.our span { color: #7aa8ea; }

.pair-name {
  font-size: 0.78rem;
  font-weight: 600;
  margin-top: 7px;
  text-transform: capitalize;
}

.pair-note {
  font-size: 0.66rem;
  color: #8c7a4e;
  line-height: 1.35;
  margin-top: 3px;
}

/* two-up lightbox */

.lightbox #lb-duo { display: none; }

.lightbox.duo .lb-stage > img { display: none; }

.lightbox.duo #lb-duo {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: center;
  max-height: 100%;
}

.lightbox.duo .lb-nav {
  display: none;
}

.lightbox #lb-duo figure {
  margin: 0;
  text-align: center;
  min-height: 0;
}

.lightbox #lb-duo figcaption {
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: 10px;
}

.lightbox #lb-duo img {
  /* Sprites are 46-96px natives; scale them UP so the pair is actually
     inspectable, and keep the pixels square while doing it. */
  width: 100%;
  height: 62vh;
  object-fit: contain;
  image-rendering: pixelated;
  background: #05070f;
  border-radius: 6px;
  padding: 10px;
}

.lightbox #lb-duo .none {
  color: #6a789c;
  border: 1px dashed #3a2a10;
  border-radius: 6px;
  padding: 60px 20px;
  font-size: 0.9rem;
}

/* listening station */

.apx-audio {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.track {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 16px;
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 20px;
  align-items: start;
}

.track .id {
  font-family: Consolas, 'Cascadia Mono', monospace;
  font-size: 0.78rem;
  color: var(--accent-2);
}

.track .purpose {
  font-size: 0.88rem;
  font-weight: 600;
  margin-top: 2px;
}

.track .when {
  font-size: 0.72rem;
  color: #6a789c;
  margin-top: 3px;
  line-height: 1.35;
}

.track audio {
  width: 100%;
  margin-top: 9px;
  height: 34px;
}

.track .specs {
  font-size: 0.68rem;
  color: #5a688c;
  font-variant-numeric: tabular-nums;
  margin-top: 5px;
}

.track .brief {
  font-size: 0.8rem;
  color: #c3cce4;
  line-height: 1.55;
}

.track .brief b {
  color: var(--muted);
  display: block;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 5px;
}

.track .verdict {
  grid-column: 1 / -1;
  border-top: 1px solid var(--line);
  padding-top: 9px;
  font-size: 0.78rem;
  color: #e0a05a;
  line-height: 1.45;
}

@media (max-width: 900px) {
  .track {
    grid-template-columns: 1fr;
  }

  .lightbox.duo #lb-duo {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .lightbox #lb-duo img {
    max-height: 32vh;
  }
}